org.locationtech.jts.geomgraph

Class DirectedEdge

java.lang.Object

org.locationtech.jts.geomgraph.EdgeEnd

org.locationtech.jts.geomgraph.DirectedEdge

All Implemented Interfaces:

Comparable

public class DirectedEdge
extends EdgeEnd

Version:

1.7

Constructor Summary

Constructors

Constructor and Description
DirectedEdge(Edge edge, boolean isForward)

Method Summary

Modifier and Type	Method and Description
static int	depthFactor(int currLocation, int nextLocation) Computes the factor for the change in depth when moving from one location to another.
int	getDepth(int position)
int	getDepthDelta()
Edge	getEdge()
EdgeRing	getEdgeRing()
EdgeRing	getMinEdgeRing()
DirectedEdge	getNext()
DirectedEdge	getNextMin()
DirectedEdge	getSym() Each Edge gives rise to a pair of symmetric DirectedEdges, in opposite directions.
boolean	isForward()
boolean	isInResult()
boolean	isInteriorAreaEdge() This is an interior Area edge if its label is an Area label for both Geometries and for each Geometry both sides are in the interior.
boolean	isLineEdge() This edge is a line edge if at least one of the labels is a line label any labels which are not line labels have all Locations = EXTERIOR
boolean	isVisited()
void	print(PrintStream out)
void	printEdge(PrintStream out)
void	setDepth(int position, int depthVal) Set depth for a position.
void	setEdgeDepths(int position, int depth) Set both edge depths.
void	setEdgeRing(EdgeRing edgeRing)
void	setInResult(boolean isInResult)
void	setMinEdgeRing(EdgeRing minEdgeRing)
void	setNext(DirectedEdge next)
void	setNextMin(DirectedEdge nextMin)
void	setSym(DirectedEdge de)
void	setVisited(boolean isVisited)
void	setVisitedEdge(boolean isVisited) Marks both DirectedEdges attached to a given Edge.

Methods inherited from class org.locationtech.jts.geomgraph.EdgeEnd

compareDirection, compareTo, computeLabel, getCoordinate, getDirectedCoordinate, getDx, getDy, getLabel, getNode, getQuadrant, setNode, toString

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

DirectedEdge

public DirectedEdge(Edge edge,
                    boolean isForward)

Method Detail

depthFactor

public static int depthFactor(int currLocation,
                              int nextLocation)

Computes the factor for the change in depth when moving from one location to another. E.g. if crossing from the Location.INTERIOR to theLocation.EXTERIOR the depth decreases, so the factor is -1.

Parameters:

currLocation - Current location

nextLocation - Next location

Returns:

change of depth moving from currLocation to nextLocation

getEdge

public Edge getEdge()

Overrides:

getEdge in class EdgeEnd

setInResult

public void setInResult(boolean isInResult)

isInResult

public boolean isInResult()

isVisited

public boolean isVisited()

setVisited

public void setVisited(boolean isVisited)

setEdgeRing

public void setEdgeRing(EdgeRing edgeRing)

getEdgeRing

public EdgeRing getEdgeRing()

setMinEdgeRing

public void setMinEdgeRing(EdgeRing minEdgeRing)

getMinEdgeRing

public EdgeRing getMinEdgeRing()

getDepth

public int getDepth(int position)

setDepth

public void setDepth(int position,
                     int depthVal)

Set depth for a position. You may also use setEdgeDepths(int, int) to update depth and opposite depth together.

Parameters:

position - Position to update

depthVal - Depth at the provided position

getDepthDelta

public int getDepthDelta()

setVisitedEdge

public void setVisitedEdge(boolean isVisited)

Marks both DirectedEdges attached to a given Edge. This is used for edges corresponding to lines, which will only appear oriented in a single direction in the result.

Parameters:

isVisited - True to mark edge as visited

getSym

public DirectedEdge getSym()

Each Edge gives rise to a pair of symmetric DirectedEdges, in opposite directions.

Returns:

the DirectedEdge for the same Edge but in the opposite direction

isForward

public boolean isForward()

setSym

public void setSym(DirectedEdge de)

getNext

public DirectedEdge getNext()

setNext

public void setNext(DirectedEdge next)

getNextMin

public DirectedEdge getNextMin()

setNextMin

public void setNextMin(DirectedEdge nextMin)

isLineEdge

public boolean isLineEdge()

This edge is a line edge if

• at least one of the labels is a line label
• any labels which are not line labels have all Locations = EXTERIOR

Returns:

If edge is a line edge

isInteriorAreaEdge

public boolean isInteriorAreaEdge()

This is an interior Area edge if

• its label is an Area label for both Geometries
• and for each Geometry both sides are in the interior.

Returns:

true if this is an interior Area edge

setEdgeDepths

public void setEdgeDepths(int position,
                          int depth)

Set both edge depths. One depth for a given side is provided. The other is computed depending on the Location transition and the depthDelta of the edge.

Parameters:

position - Position to update

depth - Depth at the provided position

print

public void print(PrintStream out)

Overrides:

print in class EdgeEnd

printEdge

public void printEdge(PrintStream out)